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VARIABLE INTEREST ENTITIES - Balances and Activity in Affordable Housing Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
Funding of equity investment			$ 1,879	$ 14,201
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure			27,977
Maximum loss exposure	$ 24,068		24,068
Income tax credits recognized	(228)	$ (38)	770	398
Affordable Housing Fund Investment
Variable Interest Entity [Line Items]
Alternative investments unfunded investment commitments	16,100		16,100
Funding of equity investment	1,161	9,312	2,164	13,871
Proportional amortization recognized	881	1,148	2,063	2,295
Affordable Housing Fund Investment | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure			43,209
Aggregate funding commitment	61,278		61,278		$ 61,278
Total amount funded	45,155		45,155		42,991
Alternative investments unfunded investment commitments	16,123		16,123		$ 18,287
Maximum loss exposure	41,146		41,146
Income tax credits recognized	$ 1,158	$ 1,152	$ 2,311	$ 2,208

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Amount of amortization expense of investment in qualified affordable housing projects.

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